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AIR MASSES PowerPoint Presentation

AIR MASSES

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AIR MASSES

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  1. AIR MASSES p. 277

  2. FRONTS Cold Front: cold air behind front (often to NW) abrupt cooling as it passes Warm Front: warm air behind front (often to S) more gradual warming Stationary front: divides airmasses, but little forward motion Occluded front: cold front “catches up” to warm front warm sector now only found aloft less temperature contrast

  3. Vertical displacement along a cold front

  4. COLD FRONT Infrared Imagery Radar Imagery

  5. Profile of a warm front

  6. Occlusion sequence p. 291

  7. DEVELOPMENT OF PRESSURE SYSTEMS

  8. Stationary Front POLAR AIRMASS POLAR FRONT SUBTROPICAL AIRMASS

  9. Maturity

  10. Lifting processes and cloud cover

  11. Occlusion

  12. Convergence and divergence along a Rossby wave

  13. Weakening Systems If lows and highs aloft and at the surface are above one another, the systems will weaken !

  14. Convergence aloft promotes the surface high Divergence aloft promotes the surface low Surface divergence Surface convergence

  15. Rossby Waves Longwaves POLAR SUBTROPICAL

  16. MIGRATE THROUGHTHE LONGWAVE TROUGHS Shortwaves

  17. BAROCLINIC WAVE 1 THEORY Condensation may release even more heat energy for the storm 2 Differential temperature advection intensifies the wave No temp advection Less upper level divergence 3 Baroclinic Instability

  18. Relative vorticity

  19. Vorticity through a Rossby wave

  20. Values of absolute vorticity on a hypothetical 500 mb map

  21. Temperature variations in the lower atmosphere lead to variations in upper-level pressure

  22. Example of a midlatitude cyclone April 15

  23. April 16

  24. April 18

  25. Flow patterns and large-scale weather • Zonal height patterns “zonal flow”

  26. Meridional flow pattern

  27. Typical winter midlatitude cyclone paths

  28. What is the term for this early stage in the life cycle of a midlatitude cyclone? A. cyclogenesis B. occlusion C. maturity D. senescence

  29. What is the term for this early stage in the life cycle of a midlatitude cyclone? A. cyclogenesis B. occlusion C. maturity D. senescence

  30. What is the term for this stage in the life cycle of a midlatitude cyclone? A. cyclogenesis B. occlusion C. maturity D. senescence

  31. What is the term for this stage in the life cycle of a midlatitude cyclone? A. cyclogenesis B. occlusion C. maturity D. senescence